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The Justice League managed to beat Superboy-Prime by sending him to an uninhabited universe only for something to go wrong and for him to start heading towards the Rick & Morty universe. Rick finds out about this during one of his adventures and realizing that he could end up having to fight something that could destroy the entire universe gets to work in his garage to prepare.
Speed Equalized.
Both at peak.
Rick has a day of preparation time.
![Superboy Prime Superboy Prime](https://vignette.wikia.nocookie.net/vsbattles/images/f/f6/Superboy_Prime.png/revision/latest/scale-to-width-down/270?cb=20150406165359)
Superboy-Prime
vs.
![Rick in jail Rick in jail](https://vignette.wikia.nocookie.net/vsbattles/images/3/34/Rick_in_jail.jpg/revision/latest/scale-to-width-down/270?cb=20160822165852)
Speed Equalized.
Both at peak.
Rick has a day of preparation time.
![Superboy Prime Superboy Prime](https://vignette.wikia.nocookie.net/vsbattles/images/f/f6/Superboy_Prime.png/revision/latest/scale-to-width-down/270?cb=20150406165359)
Superboy-Prime
vs.
![Rick in jail Rick in jail](https://vignette.wikia.nocookie.net/vsbattles/images/3/34/Rick_in_jail.jpg/revision/latest/scale-to-width-down/270?cb=20160822165852)